Preparation method of modified white carbon black with chemical isolating structures

A technology of isolation structure and silica, applied in the field of inorganic nano-powder modification, can solve the problems that the uniform dispersion of silica cannot be guaranteed, and the existence of primary particles of silica cannot be completely guaranteed.

Active Publication Date: 2017-06-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional coupling agent modification cannot ensure that the modified silica is uniformly dispersed in the polymer matrix, and cannot completely guarantee that the silica exists in the form of primary particles.

Method used

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  • Preparation method of modified white carbon black with chemical isolating structures
  • Preparation method of modified white carbon black with chemical isolating structures
  • Preparation method of modified white carbon black with chemical isolating structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Get the white carbon black VN3 powder and water by mass percentage as 15:85 stirring and mixing, and this white carbon black suspension is further stirred for 10 hours at a speed of 3500rpm using high-speed stirring, so as to obtain a uniform and stable white carbon black- Aqueous suspension, the particle size of silica in water was tested to be 538 nm. Take 600 g of the silica-water suspension and transfer it to an ultrasonic cleaning tank with a heating function. At the same time, the suspension is stirred, and the rotational speed is set to 800 rpm to keep the suspension with good fluidity. The suspension was heated to 75°C and the ultrasonic frequency was set to 30KHz. 9 g of a silane coupling agent (A) was added to this suspension, stirring was maintained, and the modification temperature was maintained, and it was made to react for 4 hours. Adjust the temperature of the tank inlet of the spray drying equipment to 160-220°C, and control the outlet temperature of t...

Embodiment 2

[0055] Take the silica Z2000 suspension slurry and mix it with water, adjust the solid mass of silica to 12% of the total mass of the suspension, stir and mix, and stir the silica suspension for 8 hours at a speed of 4500 rpm. A homogeneous and stable silica-water suspension was obtained, the dispersion state of silica in water was good, and the particle size of the silica was 513 nm after testing. Take 1000 g of the silica-water suspension and transfer it to an ultrasonic cleaning tank with a heating function. At the same time, the suspension is stirred, and the rotating speed is set to 600 rpm to keep the suspension with good fluidity. The suspension was heated to 70°C and the ultrasonic frequency was set to 25KHz. 10 g of the silane coupling agent (B) was added to this suspension, stirring was maintained, and the modification temperature was maintained, and it was made to react for 3 hours. Adjust the temperature of the tank inlet of the spray drying equipment to 160-220°C...

Embodiment 3

[0059] Take the silica K170 suspension slurry and mix it with water, adjust the solid mass of silica to 10% of the total mass of the suspension, and stir and mix, this silica suspension is further stirred at a speed of 4000rpm for 9 hours using high-speed stirring , so as to obtain a uniform and stable silica-water suspension, the dispersion state of silica in water is good, and its particle size is 487nm after testing. Take 500 g of the silica-water suspension and transfer it to an ultrasonic cleaning tank with a heating function, while stirring the suspension at 800 rpm to keep the suspension with good fluidity. The suspension was heated to 70°C and the ultrasonic frequency was set to 30KHz. 5 g of a silane coupling agent (C) was added to this silica-water suspension, stirring was maintained, and the modification temperature was maintained, and the reaction was carried out for 4 hours. Then take 500 g of the silica-water suspension and transfer it to an ultrasonic cleaning ...

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Abstract

The invention discloses a preparation method of modified white carbon black with chemical isolating structures and relates to application of a chemical isolating method to modifying white carbon black. By means of the characteristic that a saline coupling agent can be grafted to white carbon black and organic functional groups in the saline coupling agent can be reacted with special functional groups, modified white carbon black, the nanoparticles of the white carbon black of which are isolated by organic chain sections is prepared. The modified white carbon black can be uniformly dispersed stably in form of nanoparticles in a polymer substrate if being used as filler. The modification method is characterized in that by means of various methods, (I) or (II) structures are established among the nanoparticles of the white carbon black; and the nanoparticles of the white carbon black are isolated by means of the structure. The method can be directly realized by modifying the white carbon black by means of the coupling agent of the (I) or (II) structures; or can be indirectly realized by modifying the white carbon black by means of the coupling agent of the (III) structure and is then further reacted with the white carbon black modified by the saline coupling agent of an (IV) structure or a compound of an (V) structure. The formulae are as shown in the specification.

Description

[0001] Technical field: [0002] The present application relates to the technical field of inorganic nano-powder modification, and more specifically to a method for nano-modification of silica. [0003] Background technique: [0004] Silica is hydrated silica (SiO 2 -nH 2 O), commonly known as O), is an inorganic powder material commonly used in the field of polymer reinforcement. The microscopic morphology of silica has long been revealed by previous studies. The naturally occurring silica has a three-layer structure: the first layer is primary particles or primary particles, which are connected by Si-O bonds to form a random three-dimensional chain branch structure. The second layer is that a large number of primary particles are joined together by dehydration of hydroxyl groups on the surface to form a secondary structure; the third layer is that the secondary structures continue to aggregate through van der Waals forces and hydrogen bonds to form large loose aggregates ....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/06C08K9/00C08K3/36
CPCC08K3/36C08K9/00C08K9/06
Inventor 张立群郑骏驰王益庆韩冬礼叶欣张奇峰陈莺
Owner BEIJING UNIV OF CHEM TECH
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